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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prerender/resources/presentation-request.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="utils.js"></script>
<script>

assert_true(document.prerendering);

async function startPresentationRequest() {
  const bc = new PrerenderChannel('prerender-channel');
  const presentationRequest = new PresentationRequest(
      'https://example.com/presentation.html');

  try {
    const _ = await presentationRequest.start();
    bc.postMessage('unexpected success');
  } catch (err) {
    bc.postMessage('request failed');
  } finally {
    bc.close();
  }
}

startPresentationRequest();

</script>